A．His friend gave him the wrong key.B．He didn’t know where the back door was.C．He couldn’t find the key to his mailbox.D．It was too dark to put the key in the lock.
A．His friend gave him the wrong key.
B．He didn’t know where the back door was.
C．He couldn’t find the key to his mailbox.
D．It was too dark to put the key in the lock.